[" 85.If "(x^(2)+x+1)/(1-x)=a(0)+a(1)x+a...

[" 85.If "(x^(2)+x+1)/(1-x)=a_(0)+a_(1)x+a_(2)x^(2)+cdots" ,then "sum_(k=1)^(30)a_(i)" is equal to "],[[" a."148," b."146," c."149," d.none of these "]]

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